since the 2.7 commits now go to release27-maint, I've added svnmerge tracking from this branch to release26-maint. From now on, if you want to backport a commit to 2.6 you have to select the source manually via
svnmerge merge -S /python/trunk -rREV
svnmerge merge -S /python/branches/release27-maint -rREV
depending on whether the commit was made before or after the switch to release27-maint.